Finding the Third Proportional to 638,353 and 989,787.75

Step by Step Solution

1. Step 1: Write the proportion equation
   638,353 : 989,787.75 = 989,787.75 : x
2. Step 2: Convert to fraction form
   638,353/989,787.75 = 989,787.75/x
3. Step 3: Cross multiply
   638,353x = 989,787.75 × 989,787.75
4. Step 4: Simplify right side
   638,353x = 979,679,790,050.06
5. Step 5: Solve for x
   x = 979,679,790,050.06/638,353
6. Step 6: Final answer
   x = 1,534,699.12